This weekend at D23 Pixar showed off tons of concept art from their monster prequel Monsters University. Mike and Sulley go to college! See what the gruesome duo looked like before they were hot-shot scarers at Monsters Inc.

Billy Crystal and John Goodman will both be back to reprise their roles as Mike Wazowski and James P. "Sulley" Sullivan. Here's a look at Mike in his gym clothes. We seriously love that they're giving Mike a retainer. Sigh no matter how hard you try, you're never really as cool as you think you are, once you look back.